When going for an ultrasound, parents are asked if they would like to know the baby’s gender; in the case of parents who want to host a reveal party, instead of looking at the slip of paper, they’ll slip it into an envelope. The parents will then take this envelope to a baker.
The suspense builds until the parents cut the cake; inside, the pink or blue sponge reveals the gender. It’s a wonderful tradition, and a great way to share good news with everybody at once.